Unlike Space Cake, all 3 girls wI'll be obtainable and are represented on the banner.

Since they're giving us tickets to choose a free unit, most likely itll be the same event as Sakurai Tsisen where all 3 will have a Taiki version. That or swimsuit Oleev is the Taiki or the the original pilot of the main mech who became a loli gets to be the Taiki,

and Lan its also pretty popular among the anime fans, if Madoka its not very broken i plan on getting Lan's unit, that is if we can select one of the girls, they can just make a banner with all 3 and call it a day.